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CVE-2022-50569 (GCVE-0-2022-50569)

Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2026-08-05 08:59
VLAI
Title
xfrm: Update ipcomp_scratches with NULL when freed
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: Update ipcomp_scratches with NULL when freed Currently if ipcomp_alloc_scratches() fails to allocate memory ipcomp_scratches holds obsolete address. So when we try to free the percpu scratches using ipcomp_free_scratches() it tries to vfree non existent vm area. Described below: static void * __percpu *ipcomp_alloc_scratches(void) { ... scratches = alloc_percpu(void *); if (!scratches) return NULL; ipcomp_scratches does not know about this allocation failure. Therefore holding the old obsolete address. ... } So when we free, static void ipcomp_free_scratches(void) { ... scratches = ipcomp_scratches; Assigning obsolete address from ipcomp_scratches if (!scratches) return; for_each_possible_cpu(i) vfree(*per_cpu_ptr(scratches, i)); Trying to free non existent page, causing warning: trying to vfree existent vm area. ... } Fix this breakage by updating ipcomp_scrtches with NULL when scratches is freed
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < debca61df6bc2f65e020656c9c5b878d6b38d30f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a39f456d62810c0efb43cead22f98d95b53e4b1a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1e8abde895b3ac6a368cbdb372e8800c49e73a28 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 18373ed500f7cd53e24d9b0bd0f1c09d78dba87e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < be81c44242b20fc3bdcc73480ef8aaee56f5d0b6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 03155680191ef0f004b1d6a5714c5b8cd271ab61 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3bdba4440d82e0da2b1bfc35d3836c8a8e00677 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2c19945ce8095d065df550e7fe350cd5cc40c6e6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8a04d2fc700f717104bfb95b0f6694e448a4537f (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.9.331 , ≤ 4.9.* (semver)
Unaffected: 4.14.296 , ≤ 4.14.* (semver)
Unaffected: 4.19.262 , ≤ 4.19.* (semver)
Unaffected: 5.4.220 , ≤ 5.4.* (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Update ipcomp_scratches with NULL when freed\n\nCurrently if ipcomp_alloc_scratches() fails to allocate memory\nipcomp_scratches holds obsolete address. So when we try to free the\npercpu scratches using ipcomp_free_scratches() it tries to vfree non\nexistent vm area. Described below:\n\nstatic void * __percpu *ipcomp_alloc_scratches(void)\n{\n        ...\n        scratches = alloc_percpu(void *);\n        if (!scratches)\n                return NULL;\nipcomp_scratches does not know about this allocation failure.\nTherefore holding the old obsolete address.\n        ...\n}\n\nSo when we free,\n\nstatic void ipcomp_free_scratches(void)\n{\n        ...\n        scratches = ipcomp_scratches;\nAssigning obsolete address from ipcomp_scratches\n\n        if (!scratches)\n                return;\n\n        for_each_possible_cpu(i)\n               vfree(*per_cpu_ptr(scratches, i));\nTrying to free non existent page, causing warning: trying to vfree\nexistent vm area.\n        ...\n}\n\nFix this breakage by updating ipcomp_scrtches with NULL when scratches\nis freed"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - The bug is triggered only when creating/destroying IPComp XFRM states via local NETLINK_XFRM (xfrm_user_rcv_msg \u2192 xfrm_add_sa \u2192 ipcomp_init_state \u2192 ipcomp_alloc/free_scratches), not by processing remote packets on the IPComp input/output path.\nAC:L - The attacker fully controls the IPComp SA create/destroy cycle and can induce the required alloc_percpu failure via memory pressure before the next create, matching prior CNA scoring that treats attacker-induced allocation failure as Low complexity.\nPR:L - xfrm_user_rcv_msg requires CAP_NET_ADMIN via netlink_net_capable(sock_net()-\u003euser_ns), which an unprivileged user obtains with unshare -Urn; per guidance this is Low, not High.\nUI:N - The attacker opens a NETLINK_XFRM socket and sends XFRM_MSG_NEWSA/DELSA messages themselves; no separate victim action is required.\nS:U - The double-free/UAF corrupts host-kernel vmalloc/percpu state within the same OS security authority and does not cross a VM, IOMMU, or other boundary.\nC:H - After free without NULLing, the error path reads the freed percpu array to obtain scratch pointers and re-vfrees them; reclaim/spray of that memory yields a UAF read and arbitrary-vfree primitive, scored High per UAF guidance.\nI:H - Double-free of the percpu scratch pointer table and its vmalloc regions is classic heap corruption that enables arbitrary free and control-flow hijacking once the stale objects are reclaimed.\nA:H - The path produces the syzbot WARN in vfree/__vunmap and can oops/panic under panic_on_warn or corrupted free_percpu state; any UAF/double-free is High availability impact."
            }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/debca61df6bc2f65e020656c9c5b878d6b38d30f"
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      "title": "xfrm: Update ipcomp_scratches with NULL when freed",
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    "cveId": "CVE-2022-50569",
    "datePublished": "2025-10-22T13:23:25.810Z",
    "dateReserved": "2025-10-22T13:20:23.760Z",
    "dateUpdated": "2026-08-05T08:59:09.466Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2022-50569",
      "date": "2026-09-16",
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      "percentile": "0.05604"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50569\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-22T14:15:41.780\",\"lastModified\":\"2026-08-04T10:18:19.640\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm: Update ipcomp_scratches with NULL when freed\\n\\nCurrently if ipcomp_alloc_scratches() fails to allocate memory\\nipcomp_scratches holds obsolete address. So when we try to free the\\npercpu scratches using ipcomp_free_scratches() it tries to vfree non\\nexistent vm area. Described below:\\n\\nstatic void * __percpu *ipcomp_alloc_scratches(void)\\n{\\n        ...\\n        scratches = alloc_percpu(void *);\\n        if (!scratches)\\n                return NULL;\\nipcomp_scratches does not know about this allocation failure.\\nTherefore holding the old obsolete address.\\n        ...\\n}\\n\\nSo when we free,\\n\\nstatic void ipcomp_free_scratches(void)\\n{\\n        ...\\n        scratches = ipcomp_scratches;\\nAssigning obsolete address from ipcomp_scratches\\n\\n        if (!scratches)\\n                return;\\n\\n        for_each_possible_cpu(i)\\n               vfree(*per_cpu_ptr(scratches, i));\\nTrying to free non existent page, causing warning: trying to vfree\\nexistent vm area.\\n        ...\\n}\\n\\nFix this breakage by updating ipcomp_scrtches with NULL when scratches\\nis freed\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xfrm/xfrm_ipcomp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"debca61df6bc2f65e020656c9c5b878d6b38d30f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"a39f456d62810c0efb43cead22f98d95b53e4b1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"1e8abde895b3ac6a368cbdb372e8800c49e73a28\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"18373ed500f7cd53e24d9b0bd0f1c09d78dba87e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"be81c44242b20fc3bdcc73480ef8aaee56f5d0b6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"03155680191ef0f004b1d6a5714c5b8cd271ab61\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"f3bdba4440d82e0da2b1bfc35d3836c8a8e00677\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"2c19945ce8095d065df550e7fe350cd5cc40c6e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"8a04d2fc700f717104bfb95b0f6694e448a4537f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xfrm/xfrm_ipcomp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.331\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.296\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.262\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.220\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.150\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.75\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.19.17\",\"lessThanOrEqual\":\"5.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.3\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03155680191ef0f004b1d6a5714c5b8cd271ab61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/18373ed500f7cd53e24d9b0bd0f1c09d78dba87e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1e8abde895b3ac6a368cbdb372e8800c49e73a28\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2c19945ce8095d065df550e7fe350cd5cc40c6e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a04d2fc700f717104bfb95b0f6694e448a4537f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a39f456d62810c0efb43cead22f98d95b53e4b1a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be81c44242b20fc3bdcc73480ef8aaee56f5d0b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/debca61df6bc2f65e020656c9c5b878d6b38d30f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f3bdba4440d82e0da2b1bfc35d3836c8a8e00677\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:37:41+00:00",
      "cve": "CVE-2022-50569",
      "id": "CVE-2022-50569",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "321",
      "product_status:known_affected": "66",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: Update ipcomp_scratches with NULL when freed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50569.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.